| This very good low power/wide field 2” eyepiece does a fine job of capturing galaxies and galaxy clusters, viewing emission and reflection nebulas in their entirety, etc. You can use the calculator below to see just how wide a field it will give you with your particular scope. It provides a very wide 7.1mm exit pupil with an f/4.5 Dobsonian reflector for rich field scanning of the Milky Way star clouds in Sagittarius from a dark sky site. As the eyes of some observers may no longer be able to dilate to a full 7mm, however, this eyepiece could potentially waste some of the light-gathering capability of a fast focal ratio scope. Thought should be given to matching its exit pupil size to your eyesight before purchasing if you have a fast focal ratio scope, unless you are content to give up some light gathering in exchange for a wider view of the universe. If you have a 2” focuser or star diagonal, this is an excellent choice to replace the usually so-so 26mm eyepiece that comes with many scopes, not only to improve the edge-to-edge sharpness, but to give a wider and brighter field of view, as well. Its substantial eye relief means unvignetted viewing for many of those who must wear eyeglasses while observing due to astigmatism. |
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